fix: improve AI coach chat context, 128k window, and output limits

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/hub_ai/chat.py

@@ -5,7 +5,13 @@ from typing import Any, Optional
 
 from hub_ai.attachments import parse_chat_attachments
 from hub_ai.client import generate_text, model_label
-from hub_ai.config import CHAT_MAX_HISTORY_TURNS, CHAT_TEMPERATURE
+from hub_ai.config import (
+    CHAT_CONTEXT_MAX_CHARS,
+    CHAT_MAX_HISTORY_TURNS,
+    CHAT_MAX_OUTPUT_TOKENS,
+    CHAT_SUMMARY_EXCERPT_MAX_CHARS,
+    CHAT_TEMPERATURE,
+)
 from hub_ai.context import build_daily_context, format_chat_context_for_chat
 from hub_ai.prompts import CHAT_SYSTEM, build_chat_user_prompt
 from hub_ai.store import (
@@ -81,8 +87,8 @@ def send_chat_message(
         attachments=parsed.get("attachment_meta") or [],
     )
 
-    brief_ctx = format_chat_context_for_chat(ctx)
-    excerpt = summary_excerpt_for_chat(day)
+    brief_ctx = format_chat_context_for_chat(ctx, max_chars=CHAT_CONTEXT_MAX_CHARS)
+    excerpt = summary_excerpt_for_chat(day, max_chars=CHAT_SUMMARY_EXCERPT_MAX_CHARS)
 
     user_prompt = build_chat_user_prompt(
         context_text=brief_ctx,
@@ -100,6 +106,7 @@ def send_chat_message(
         user=user_prompt,
         temperature=CHAT_TEMPERATURE,
         images_b64=parsed.get("images_b64") or None,
+        max_tokens=CHAT_MAX_OUTPUT_TOKENS,
     )
     if reply.startswith("AI 调用失败"):
         return {"ok": False, "msg": reply, "session_id": sid}